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On the formation of calcium(II) taurocholate aggregate species in aqueous solution

机译：水溶液中牛磺胆酸钙（II）聚集体的形成

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摘要

The influence of the presence of calcium(II) ions in solutions containing sodium and taurocholate ions at 25 degrees C and in 0.5 mol dm(-3) N(CH3)(4)Cl as the constant ionic medium was studied. The composition and existence range of aggregates formed by taurocholate sodium and calcium(II) were investigated by means of two different procedures. First, the increasing calcium oxalate solubility due to the presence of taurocholate ions was studied as a function of the taurocholate, sodium and hydrogen ions. The free concentration of sodium and hydrogen ions was determined in solutions equilibrated with solid calcium(II) oxalate. After filtration, the concentration of calcium(II) (by atomic absorption spectrophotometry) and that of oxalate were also determined. In the second approach, electromotive force measurements carried out in solutions containing taurocholate, sodium and calcium(II) ions provided hydrogen and sodium ions free concentrations. The results from both procedures could be explained by assuming the presence of aggregates of different composition with the participation of sodium, calcium(II) and taurocholate ions, depending on the concentration of the reagents. No protonated species were present in appreciable concentrations. All the species found have even anion aggregation numbers. A strong analogy with the composition of sodium taurocholate and glycocholate is observed, while a comparison with sodium deoxycholate, glycodeoxycholate and taurodeoxycholate shows wide differences.
机译：研究了在25摄氏度和0.5 mol dm（-3）N（CH3）（4）Cl作为恒定离子介质的情况下，含钠和牛磺胆酸盐离子的溶液中钙（II）离子的存在的影响。通过两种不同的方法研究了牛磺胆酸钠和钙形成的聚集体的组成和存在范围。首先，研究了由于牛磺胆酸根离子的存在而增加的草酸钙溶解度与牛磺胆酸根，钠离子和氢离子的关系。在用草酸钙（II）固体平衡的溶液中测定钠和氢离子的自由浓度。过滤后，还测定了钙（II）的浓度（通过原子吸收分光光度法）和草酸盐的浓度。在第二种方法中，在含有牛磺胆酸盐，钠和钙（II）离子的溶液中进行电动势测量，可得到无氢和钠离子的浓度。两种方法的结果可以通过假设存在不同组成的聚集体来解释，这些聚集体的存在取决于钠离子，钙离子（II）和牛磺胆酸根离子，具体取决于试剂的浓度。没有明显浓度的质子化物种。发现的所有物种甚至具有阴离子聚集数。观察到与牛磺胆酸钠和糖胆酸钠的组成有很强的类比，而与脱氧胆酸钠，糖脱氧胆酸钠和牛磺脱氧胆酸钠的比较显示出很大的差异。

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